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Electric propulsion becomes more and more important. Despite the fact that appropriate design tools tailored for the use with electric propulsion systems have to be developed, test benches for verification and hardware-in-the-loop simulations are needed. The battery system, as it is a very important component, is in the focus of this article. Facing the costs of real hardware components a realtime emulation with programmable power supplies and electric loads seems reasonable. This article introduces an approaches in battery modeling and figures out the main influences of the model parameters. Because of a very strong impact of the thermal behavior on the parameters a dedicated thermal model is proposed. One major point is the modularized modeling and the coupling of the different physical domains. The advantage of this approach is that the granularity of the single modules can be adjusted separately to fit the dedicated needs of a given task. For battery emulation the entire model has to be implemented on a realtime platform. The article gives a detailed overview and demonstrates the feasibility of the entire system in practical experiments.

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